TELEPHONE No. 78

The telephone comprises of a handset (Telephone No. 78) and a base (Stand, Table, for Telephone No. 78) or a wall hook (Suspender, micro-telephone, No. 2).

The handset had a switch that muted the transmitter when in the normal position.

The receiver has a resistance of 60ohms.

There is no documentation for this telephone but the diagram intimates that the handset is a self contained unit, which included an internal switch hook.  To operate the switch hook the handset would be hang on a stand or a wall hook.  It is also debatable as to why it is called an adjustable telephone.

Produced by the Western Electric Co. (Their Model 4005).

A model with no dial was also produced by the British Western Electric Co. (Their Model 40340).

Used with Bellset No. 1.

A C.B. version of this telephone was tested by the GPO in 1915 and the dial variant probably introduced in the late 1920's if at all.

The picture is dated 1927.

Found in the 1914 and 1915 Rate Books.

Telephone includes (1928):-
1 x Connection, Mouthpiece No. 5.
1 x Cord, Instrument No. 342.
1 x Earpiece No. 2.
1 x Mouthpiece No. 12.
1 x Transmitter, Inset No. 1.

To be requisitioned separately :-
1 x Suspender, micro-telephone, No. 2, or
1 x Stand, Table, for Telephone No. 78 (1914).

Circuit diagram - N178.
 

Last revised: May 15, 2026